Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-10-11
Phys.Rev. B67 (2003) 115125
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages 7 pages appendix 11 figures
Scientific paper
10.1103/PhysRevB.67.115125
The conductivity in quasi two-dimensional systems is calculated using the quantum kinetic equation. Linearizing the Lenard-Balescu collision integral with the extension to include external field dependences allows one to calculate the conductivity with diagrams beyond the GW approximation including maximally crossed lines. Consequently the weak localization correction as an interference effect appears here from the field dependence of the collision integral (the latter dependence sometimes called intra-collisional field effect). It is shown that this weak localization correction has the same origin as the Debye-Onsager relaxation effect in plasma physics. The approximation is applied to a system of quasi two-dimensional electrons in hetero-junctions which interact with charged and neutral impurities and the low temperature correction to the conductivity is calculated analytically. It turns out that the dynamical screening due to charged impurities leads to a linear temperature dependence, while the scattering from neutral impurities leads to the usual Fermi-liquid behavior. By considering an appropriate mass action law to determine the ratio of charged to neutral impurities we can describe the experimental metal-insulator transition at low temperatures as a Mott-Hubbard transition.
No associations
LandOfFree
Conductivity in quasi two-dimensional systems does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Conductivity in quasi two-dimensional systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Conductivity in quasi two-dimensional systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-298264